addresses argus's review on #4842 (c88740): fetch's success path was
silent when the response parsed but windows() found nothing to record.
should_warn_empty tracks the same once-per-streak shape as the
existing token-skip logging, reset the moment a response has windows
again, and never logs the body.
Also notes in the observability doc that a past resets_at means the
paired percent gauge is stale.
A detached task polls GET https://api.anthropic.com/api/oauth/usage every
5 minutes with the OAuth access token from ~/.claude/.credentials.json and
records, per window the response names (five_hour, seven_day,
seven_day_sonnet, ...):
- hyperhive.agent.claude_usage.percent (%, 0-100)
- hyperhive.agent.claude_usage.resets_at (s, unix seconds)
both labelled window=<name>. Endpoint, the anthropic-beta:
oauth-2025-04-20 header and the {utilization, resets_at} window shape are
taken from the claude-code 2.1.283 bundle's own /usage fetch.
The token is only read, never refreshed: claude owns refresh-token
rotation and a second refresher can log the agent out. An expired token
is skipped until claude's next turn refreshes it. API-key agents
(HIVE_USE_API_KEY, the ACP default) and agents with no credentials file
skip quietly, and the task does nothing when OTEL is not configured.
Request failures and non-2xx statuses warn with the status or transport
error only, never the body or the token.
